<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
       .d1{
            width: 200px;
            height: 200px;
            padding: 20px;
            border: 5px solid #ccc;
            background-color: aqua;

        }
        .d2{
            box-sizing:border-box;
            width: 200px;
            height: 200px;
            padding: 20px;
            border: 5px solid #ccc;
            background-color: aqua;

        }
    </style>
</head>
<body>
    
    <div class="d1">
       IE盒子模型
    </div>

    <div class="d2">
       标准盒模型
    </div>
</body>
</html>